def usd_test_if_amount_has_any_characters(self):
self.assertEqual(usd_currency(""), "That's not a valid currency amount")
def test_currency_changes_for_a_number_that_has_a_decimal_to_only_2_places_to_usd(self):
self.assertEqual(usd_currency(.86), .96)
def usd_test_if_not_an_integer(self):
self.assertEqual(usd_currency("a"), "That's not a valid currency amount")
def test_currency_changes_for_one_number_to_usd(self):
self.assertEqual(usd_currency(.9), 1)
